initial commit. phase 1 complete

frontend/node_modules/culori/src/cubehelix/convertCubehelixToRgb.js

@@ -0,0 +1,21 @@
+import { degToRad, M } from './constants.js';
+
+const convertCubehelixToRgb = ({ h, s, l, alpha }) => {
+	let res = { mode: 'rgb' };
+
+	h = (h === undefined ? 0 : h + 120) * degToRad;
+
+	let amp = s === undefined ? 0 : s * l * (1 - l);
+
+	let cosh = Math.cos(h);
+	let sinh = Math.sin(h);
+
+	res.r = l + amp * (M[0] * cosh + M[1] * sinh);
+	res.g = l + amp * (M[2] * cosh + M[3] * sinh);
+	res.b = l + amp * (M[4] * cosh + M[5] * sinh);
+
+	if (alpha !== undefined) res.alpha = alpha;
+	return res;
+};
+
+export default convertCubehelixToRgb;